螯合反应型净味剂对橡塑沥青的净味效果与反应机理

Deodorizing Effect and Reaction Mechanism of Chelation Reaction Type Deodorizer on Rubber-Plastic Asphalt

摘要:

为解决橡塑沥青传统抑烟净味技术效果不佳的问题，基于沥青技术性能测试、气味强度评价以及烟气气相色谱-质谱（GC-MS）分析，研究了螯合反应型净味剂在橡塑沥青中的净味效果与反应机理。结果表明：在0.015%~0.035%掺量范围内，净味剂对沥青技术性能无不利影响；掺加净味剂后，气味强度从4级降至0级，烟气质量减少15.4%~44.3%，烟气种类减少5~9种；随着净味剂掺量的增加，恶臭、有毒及小分子无味烟气含量下降，大分子无味烟气含量上升。该净味剂通过与烟气中含S、N、O及双键等富电子基团发生络合反应实现净味作用，反应程度取决于反应物含量及其化学活性。

Abstract:

To address the deficiencies of conventional smoke-suppressing and deodorization technologies for rubber-plastic asphalt， investigations were conducted into the deodorization efficacy and reaction mechanism of a chelation-reactive deodorizer in rubber-plastic asphalt via asphalt technical performance tests， odor intensity evaluations， and gas chromatography-mass spectrometry （GC-MS） analysis of asphalt fume. The results show that when the deodorizer’s dosage is in the range of 0.015%-0.035%， no adverse impacts are exerted on the technical performances of asphalt. Specifically， the odor intensity is reduced from grade 4 to grade 0； the mass of asphalt fume is decreased by 15.4%-44.3%， and the number of asphalt fume component types is cut by 5-9 species. With the increase in deodorizer dosage， the contents of malodorous， toxic， and small-molecule odorless flue gas components are declined progressively， while the content of large-molecule odorless flue gas components is increased accordingly. Mechanistically， the deodorizer’s performance is achieved via complexation reactions with electron-rich functional groups in asphalt fume （including those containing S， N， O， and carbon-carbon double bonds）， where the extent of complexation is dependent on the content of reactants and their chemical reactivity.